android中RecyclerView的简单使用（二），三面头条+四面阿里+五面腾讯拿offer分享面经总结

本文主要是介绍android中RecyclerView的简单使用（二），三面头条+四面阿里+五面腾讯拿offer分享面经总结，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

在ListView中，Google为我们提供了SetDivider(Drawable divider)这样的方法来设置分隔线，那么在RecyclerView中，Google又为我们提供了什么样的方法去添加分隔线呢？通过查看官方文档，它，提供了:addItemDecoration(RecyclerView.ItemDecoration decor)这个方法了设置分隔线，那问题又来了，RecyclerView.ItemDecoration是什么东西呢？（文章结尾部分做出了解释）

那么接下来就将分割线的有关代码贴出来，并将我自己的理解描述一下。

首先先贴代码：

import java.util.ArrayList;

import android.os.Bundle;

import android.app.Activity;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Rect;

import android.graphics.drawable.Drawable;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.support.v7
.widget.RecyclerView.ItemDecoration;

import android.support.v7.widget.RecyclerView.LayoutParams;

import android.support.v7.widget.RecyclerView.State;

import android.support.v7.widget.RecyclerView.ViewHolder;

import android.support.v7.widget.StaggeredGridLayoutManager;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.LinearLayout;

import android.widget.TextView;

public class MainActivity extends Activity {

// 创建集合，存放数据

private ArrayList list = new ArrayList();

private RecyclerView recyclerView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// 查找控件

recyclerView = (RecyclerView) findViewById(R.id.rview);

// 初始化list集合

for (int i = 0; i < 100; i++) {

list.add("数据 " + i);

}

MyAdapter adapter = new MyAdapter(MainActivity.this, list);

//将适配器放到recyclerView上

//创建线性布局管理者对象

LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);

//StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2,

// RecyclerView.VERTICAL);

//通过manager对象设置显示方向

manager.setOrientation(RecyclerView.VERTICAL);

//将管理者对象给recyclerView

recyclerView.setLayoutManager(manager);

recyclerView.setAdapter(adapter);

recyclerView.addItemDecoration(new MyDecor(MainActivity.this, RecyclerView.VERTICAL));

}

}

class MyAdapter extends RecyclerView.Adapter {

// 声明两个属性，接收传递过来的数据

private Context context;

private ArrayList list;

private MyViewHolder viewHolder;

// 创建一个构造方法，将数据和activity的上下文传递过来

public MyAdapter(Context context, ArrayList list) {

this.context = context;

this.list = list;

}

// 返回显示的条目个数

@Override

public int getItemCount() {

// TODO Auto-generated method stub

return list.size();

}

@Override

public void onBindViewHolder(ViewHolder arg0, int arg1) {

// 将父类的对象强转为子类对象

// MyViewHolder myViewHolder = (MyViewHolder) arg0;

if (arg0 instanceof MyViewHolder) {

viewHolder = (MyViewHolder) arg0;

}

String ss = list.get(arg1);

viewHolder.textView.setText(ss);

}

// 创建viewholder对象，并将对象返回

@Override

public ViewHolder onCreateViewHolder(ViewGroup arg0, int arg1) {

View view = LayoutInflater.from(context).inflate(R.layout.re, null);

ViewHolder viewHolder = new MyViewHolder(view);

return viewHolder;

}

class MyViewHolder extends ViewHolder {

TextView textView;

public MyViewHolder(View view) {

super(view);

textView = (TextView) view.findViewById(R.id.tview);

}

}

}

class MyDecor extends ItemDecoration {

//定义一个水平和竖直常量

private final int Horization = RecyclerView.HORIZONTAL;

private final int Vertical = RecyclerView.VERTICAL;

//创建一个int型的数组,在数组中存放android中自带的分割线

private int [] attrs = {android.R.attr.listDivider};

//声明一个图片对象

private Drawable drawable;

//声明一个RecyclerView的方向

private int oritation;

public MyDecor (Context context,int orization){

TypedArray array = context.obtainStyledAttributes(attrs);

drawable = array.getDrawable(0);

//让这个属性重复使用

array.recycle();

//判断方向

if (orization != Horization && orization != Vertical) {

//如果既不是水平又不是竖直的，抛出异常

throw new IllegalArgumentException(“没有该方向”);

}else {

oritation = orization;

}

}

@Override

public void onDraw(Canvas c, RecyclerView parent, State state) {

// TODO Auto-generated method stub

super.onDraw(c, parent, state);

if (oritation == Vertical) {

new IllegalArgumentException(“没有该方向”);

}else {

oritation = orization;

}

}

@Override

public void onDraw(Canvas c, RecyclerView parent, State state) {

// TODO Auto-generated method stub

super.onDraw(c, parent, state);

if (oritation == Vertical) {

这篇关于android中RecyclerView的简单使用（二），三面头条+四面阿里+五面腾讯拿offer分享面经总结的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---